Knock-outing a strong tournament player

I just played a very sharp game with a strong tournament player (1887 Elo). In the early middle game I had a beautiful position:

My next move was Nc5, attacking my opponent's light-square bishop. Nc5 was a sophisticated decoy move.

Of course, my opponent had to move his light-square bishop.

My opponent played Bd5, which looks like a logical move that does two things:

1. It gives Black the option to fork my rooks.

2. It prevents me from playing the move Bf3 (with a potential checkmate on b7).

Unfortunately, Bd5 was a Huge mistake!

My next move was so powerful, that my opponent resigned immediately.

Can you find the devastating move?

This is the complete game, from chess tempo:

Your opponent definitely should've noticed his king had no escape squares after knight c5. That usually leads to trouble as we all know. At first glance I might've played 16. Bf5 as black, but then 17. Bf3 would be annoying. What was the time control? 

Yep, the move 16.Bf5 looks much better. After 17.Bf3 my opponent could play 17...c6 and block the threat on b7. After 17...c6 he/she would be okay.

This was a standard game. My opponent and I had 45 minutes on the clock. No time increment.